Imaging the point spread function of hyperspectral cameras: the full truth about coregistration error and resolution

Gard M. Selnesaunet; Marie B. Henriksen; Torbjørn Skauli

doi:10.1117/12.2677604

20 October 2023 Imaging the point spread function of hyperspectral cameras: the full truth about coregistration error and resolution

Gard M. Selnesaunet, Marie B. Henriksen, Torbjørn Skauli

Author Affiliations +

Proceedings Volume 12688, Imaging Spectrometry XXVI: Applications, Sensors, and Processing; 1268804 (2023) https://doi.org/10.1117/12.2677604
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States

Abstract

In hyperspectral imaging, the integrity of the spectral signal is critical in order to satisfy the requirements inherent in spectral image processing. There is a need to establish methods for measuring and quantifying band-to-band coregistration errors in the point spread function, as a supplement to customary resolution specifications. The IEEE P4001 working group is creating a standard for hyperspectral imaging which will include metrics for such imperfections. In this work, we discuss a measurement technique that characterizes a hyperspectral camera by creating an image of the point spread function in each band, building on earlier results [H. E. Torkildsen and T. Skauli, Opt. Lett. Vol. 43, No. 16, 2018]. We discuss the implementation of this technique using a collimator suitable for routine camera testing. A line source is projected through the collimator. The source is scanned across a pixel in many different directions. Each scan produces a line spread function, and the set of line spread functions can be transformed into a 2D image of the point spread function via the Radon transform. We argue that this way of characterizing the spatial resolution of a hyperspectral camera is feasible without extraordinary experimental effort, and that it can be considered for inclusion in future versions of the standard. A simplified method requiring only two scans is also explored.

Conference Presentation

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Gard M. Selnesaunet, Marie B. Henriksen, and Torbjørn Skauli "Imaging the point spread function of hyperspectral cameras: the full truth about coregistration error and resolution", Proc. SPIE 12688, Imaging Spectrometry XXVI: Applications, Sensors, and Processing, 1268804 (20 October 2023); https://doi.org/10.1117/12.2677604

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